Check this webpage for regional and national news and information about building energy efficiency, energy code updates and development, and equipment efficiency standards.

RESOURCE UPDATE! - 2021 SEC ENVELOPE & LIGHTING RESOURCES ADDED TO THE WSEC WEBTOOL

The WSEC website now supports the 2021 Seattle Energy Code envelope and lighting requirements. 

UPDATED - March 16th, 2026

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2021 WSEC-C ADDITIONAL ENERGY EFFICIENCY & LOAD MANAGEMENT CREDITS COMPLIANCE WORKSHEETS.V6

Excel forms have been developed to help designers calculate Required and Achieved additional energy efficiency and load management credits, and renewable energy credits, to demonstrate compliance with the 2021 WSEC-C. These forms have been updated with additional information based on industry feedback. 

Refer to the TECHNICAL RESOURCES section of the Education & Resources page for a link to the latest v6 update of this compliance tool, revised in February 2026.

UPDATED - February 15th, 2026

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2021 WASHINGTON STATE ENERGY CODES

Effective date of the 2021 WSEC is March 15th, 2024 

On November 28, 2023, the WA State Building Code Council (SBCC) conducted an affirmative vote to modify sections in the commercial and residential energy codes to address legal uncertainty stemming from the decision in California Restaurant Association v. City of Berkeley recently issued by the Ninth Circuit Court of Appeals. These modifications apply primarily to the mechanical, service water heating and additional energy efficiency measure provisions in the 2021 WSEC that go into effect on March 15th, 2024. 

CLICK HERE to go to the Washington State Building Code Council website for the latest news.

UPDATED - November 30th, 2023

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WSEC COMMERCIAL COMPLIANCE DOCUMENTATION WEBTOOL 

This online resource captures many details from the WSEC for envelope, mechanical and lighting systems. Many jurisdictions require this documentation for a project permit submittal. 

READY TO GET STARTED WITH THE WEBTOOL? Create an account and then select My Projects to set up a new project and explore all the helpful features.

UPDATED - January 10th, 2023

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CLEAN ENERGY TRANSFORMATION ACT (CETA) 

CETA (SB 5116) was implemented in May 2019. It commits Washington to an eletricity supply free of greenhouse gas emissions by 2045.

"CETA is a complex law requiring transformation of an essential service, electricity, and many agencies and stakeholders will work together to achieve its objectives. Commerce will work closely with the Utilities and Transportation Commission (UTC), which regulates the rates and service of investor-owned utilities. Other state agency partners include the state auditor and the departments of Ecology and Health.

More than 60 electric utilities must comply with CETA. Interested stakeholders represent business customers, low-income and vulnerable communities, consumers, environmental advocates and renewable energy developers." WA State Energy Office - WA Dept of Commerce

Click here for more information about CETA.

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WSEC COMMERCIAL TECHNICAL SUPPORT - ETC

Evergreen Technology Consulting (ETC) provides commercial energy code technical support services for WA State. We provide classroom and online training, technical topic resources, on-line compliance documentation tools and on-call technical support. 

Refer to the Ask A Question page to reach our commercial energy code experts.